Unity 8
windowkeysfilter.cpp
1 /*
2  * Copyright (C) 2014 Canonical, Ltd.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; version 3.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program. If not, see <http://www.gnu.org/licenses/>.
15  *
16  * Author: Daniel d'Andrada <daniel.dandrada@canonical.com>
17  */
18 
19 #include "windowkeysfilter.h"
20 
21 #include <QQuickWindow>
22 
23 WindowKeysFilter::WindowKeysFilter(QQuickItem *parent)
24  : QQuickItem(parent)
25 {
26  connect(this, &QQuickItem::windowChanged,
27  this, &WindowKeysFilter::setupFilterOnWindow);
28 }
29 
30 bool WindowKeysFilter::eventFilter(QObject *watched, QEvent *event)
31 {
32  Q_ASSERT(!m_filteredWindow.isNull());
33  Q_ASSERT(watched == static_cast<QObject*>(m_filteredWindow.data()));
34  Q_UNUSED(watched);
35 
36  if (event->type() == QEvent::KeyPress || event->type() == QEvent::KeyRelease) {
37  // Let QML see this event and decide if it does not want it
38  event->accept();
39  QCoreApplication::sendEvent(this, event);
40  return event->isAccepted();
41  } else {
42  // Not interested
43  return false;
44  }
45 }
46 
47 void WindowKeysFilter::setupFilterOnWindow(QQuickWindow *window)
48 {
49  if (!m_filteredWindow.isNull()) {
50  m_filteredWindow->removeEventFilter(this);
51  m_filteredWindow.clear();
52  }
53 
54  if (window) {
55  window->installEventFilter(this);
56  m_filteredWindow = window;
57  }
58 }